Duke University - Department of Economics, University of Illinois at Urbana-Champaign - Department of Economics, University of Pennsylvania - The Wharton School and University of Toronto - Department of Economics

Duke University - Department of Economics, affiliation not provided to SSRN, University of Illinois at Urbana-Champaign - Department of Economics, University of Pennsylvania - The Wharton School and University of Toronto - Department of Economics

Duke University - Department of Economics, University of Illinois at Urbana-Champaign - Department of Economics, University of Pennsylvania - The Wharton School and University of Toronto - Department of Economics